Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03006—Arrangements for removing intersymbol interference
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03006—Arrangements for removing intersymbol interference
  • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
  • H04L2025/03802—Signalling on the reverse channel
  • H04L2025/03815—Transmission of a training request
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0001—Arrangements for dividing the transmission path
  • H04L5/0003—Two-dimensional division
  • H04L5/0005—Time-frequency
  • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
  • H04L5/0035—Resource allocation in a cooperative multipoint environment
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W84/00—Network topologies
  • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
  • H04W84/10—Small scale networks; Flat hierarchical networks
  • H04W84/12—WLAN [Wireless Local Area Networks]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
  • Y02D30/00—Reducing energy consumption in communication networks
  • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

• the present invention relates to a communication device, a communication method, and a program, and more specifically to a communication control technique in wireless LAN.
• the 802.11 standard is known.
• the EEE 802.11 ax standard which is the latest standard of the IEEE 802.11 standard series, uses OF DMA (Orthogonal Frequency Division Multiple Access) to achieve high peak throughput and communication under congested conditions. It has achieved speed improvement (see Patent Document 1).
• OF DMA Orthogonal Frequency Division Multiple Access
• EHT Extremely High T hroughput
• Patent Document 1 Japanese Unexamined Patent Publication No. 2018_0501 33
• BSS Basic Service Set
• Mu I ti-AP Coordination configuration is used as described above.However, in this case, how to set BSS c ⁇ I ⁇ r It is not clear how you are.
• the present invention provides a method for appropriately executing settings for a plurality of access points to transmit data to a terminal in parallel.
• a communication device includes a first B a s i c Ser v i c e
• S et (BSS) constructing means and a transmitting means for transmitting a radio frame having a physical layer (P HY) preamble and a data field, wherein the preamble is L egacy S hort T raining F ield (L— ST F), and L egacy Long T raining F ield (L— LT F) arranged immediately after the L— STF in the radio frame, and in the radio frame.
• L egacy Signal Field (L — SIG) arranged immediately after the L — LTF
• EHT_S I G_A EHTS hort Raining F ield (E HT-ST F) arranged after the EHT-S G A in the radio frame, and the EH TS TF in the radio frame
• EHT Long Raining Field (E HT-LT F) arranged immediately after
• the EHT-SIG-A includes a subfield for setting BSS c ⁇ I ⁇ r, and the communication device and When the radio frame is transmitted to the second other communication device in cooperation with the first other communication device, the BSS color used in the first BSS is not changed, and the second other communication device is not changed. Based on the BSS co ⁇ r of the second BSS to which the communication device belongs ⁇ 02020/175052 3 ((171?2020/004259
• a plurality of access points can appropriately perform settings for transmitting data to a terminal in parallel.
• Figure 1 is a diagram showing an example of the network configuration.
• FIG. 2 is a diagram showing an example of the hardware configuration of the eight and three eight.
• FIG. 3 is a diagram showing an example of the functional configuration of the eight and three eight.
• Fig. 7 is a diagram showing an example of the flow of processing executed in the network.
• FIG. 8 is a diagram showing an example of the flow of processing executed in FIG. MODE FOR CARRYING OUT THE INVENTION
• FIG. 1 shows an example of the configuration of the wireless communication network of this embodiment.
• This wireless communication network consists of access points (AP 102, AP 104) and terminals (STA 103, STA 105), which are IEEE 802.1 1 E HT (Extensively High Throughput) devices, respectively. ) And are included.
• the access point may be referred to as “AP” and the station may be referred to as “STA” without a reference number when it does not refer to a specific device.
• FIG. 1 shows a wireless communication network including two APs and two STAs as an example, the number of these communication devices may be three or more, for example.
• the coverage of the network formed by AP 102 and 8 104 is indicated by the circle 10 1.
• the communicable range may cover a wider range or only a narrower range.
• Fig. 1 shows an STA that complies with the IEEE 802.11 EHT standard. However, there is an STA that supports only the generation standard (legacy standard) before the IEEE 802.11 EHT standard. You may. Note that E HT may be understood as an abbreviation for Ext r e me H i g h T h r u u g h p u t.
• AP 102 and AP 104 can mutually receive the signal transmitted by the other AP.
• the connection form is not particularly limited, and AP 102 and AP 104 may be connected by wire or wirelessly.
• AP 102 and AP 104 support the IEEE 802.11 EHT Multi-AP Coordination configuration and can transmit data to one STA in parallel in cooperation with each other.
• STA 105 can transmit and receive radio frames in parallel with AP 102 and AP 104 that operate in cooperation.
• ST A 105 has, for example, a plurality of wireless LAN control units and can transmit and receive wireless frames to and from a plurality of APs using different wireless channels. ⁇ 02020/175052 5 ⁇ (: 171?2020/004259
• the 3-chome 105 may have one physical control unit capable of processing a plurality of frames received in parallel via a plurality of wireless channels. That is, the 3-chome 105 has a configuration capable of logically processing a plurality of wireless communications in parallel by physically using one or a plurality of control devices.
• Figure 2 shows the hardware configuration of eight (8 102, 8 104) and 3 8 (3 103, 3 105).
• these communication devices have a storage unit 201, a control unit 202, a function unit 203, an input unit 204, an output unit 205, a communication unit 206, and an antenna 207.
• the storage unit 201 is [Equipped with both 1/8/1 and/or either one], and stores various information such as a program for performing various operations described below and communication parameters for wireless communication. As the storage unit 201,
• Flexible disk hard disk, optical disk, magneto-optical disk,
• a storage medium such as a magnetic tape, a non-volatile memory card, or a mouth V 0 may be used.
• the control unit 202 is, for example, a processor such as 0 II or IV! II, 8 3 I 0 (integrated circuit for special application), 03? (Digital signal processor), 0 8 (field programmable gate array), etc. It is composed of here, 02 controls the entire apparatus by executing the program stored in the storage unit 201.
• the control unit 202 stores the programs stored in the storage unit 201. The entire device may be controlled in cooperation with I 1 ⁇ 9 3 source 3 6111).
• control unit 202 controls the functional unit 203 to execute a predetermined process such as imaging, printing, projection and the like.
• the functional unit 203 is hardware for the device to execute a predetermined process. For example, if the device is a camera, functional unit 203 This is an imaging unit and performs imaging processing. Further, for example, when the device is a printer, the functional unit 203 is a printing unit and performs print processing. Further, for example, when the device is a projector, the functional unit 203 is a projection unit and performs projection processing.
• the data processed by the function unit 203 may be data stored in the storage unit 201 or may be data communicated with another AP or STA via the communication unit 206 described later.
• the input unit 204 receives various operations from the user.
• the output unit 205 performs various outputs to the user.
• the output by the output unit 205 includes, for example, at least one of a display on a screen, a voice output from a speaker, a vibration output, and the like.
• both the input unit 204 and the output unit 205 may be realized by one module like a touch panel.
• the communication unit 206 controls wireless communication conforming to the IEEE 802.11 standard series and control of P communication.
• the communication unit 206 can execute processing that complies with at least the IEEE 802.11 EHT standard.
• the communication unit 206 controls the antenna 207 to send and receive wireless signals for wireless communication.
• the device communicates content such as image data, document data, and video data with another communication device via the communication unit 206.
• the antenna 207 is, for example, an antenna capable of transmitting and receiving at least one of the sub GHz band, the 2.4 GHz band, the 5 GHz band, and the 6 GHz band.
• the frequency band (and the combination thereof) that can be supported by the antenna 207 is not particularly limited.
• the antenna 207 may be a single antenna or a set of two or more antennas for transmitting and receiving MIM (Mu lti — Input and Multi — Out put). Further, although one antenna 207 is shown in FIG. 2, it may include, for example, two or more antennas (two or more sets) capable of supporting different frequency bands.
• the antenna 207 is configured so as to be compatible with the communication of the Distributed Coordinaiton of the IEEE 802.11 EHT standard.
• AP is D— M for J TX (J oint T ransmission) It has a configuration that enables transmission of IM (Distributed MI MO).
• J TX is one element for realizing the Multi-AP Coordination function that will be newly introduced from IEEE 802.11 EHT. It refers to sending data to one STA in parallel.
• the Mu l t i — AP P o r d i n a t i o n function is a function that improves the transmission and reception throughput and signal strength on the ST A side by the cooperation of multiple APs. As the wireless technology at this time, D-MIMO can be used.
• D-MIMO is a technology in which multiple APs communicate with one STA on the same time and same frequency channel (eg, the same RU (R e s u u r c e U n i t) of ⁇ F DMA (Orthogonal Frequency Division Multiple Access)).
• D-M MO High-speed communication can be realized by improving space utilization efficiency.
• the minimum configuration of D-M M M is M-A P (master A P), S-A P (slave A P), and ST A. In this case, under control of M-AP, two APs M-AP and S-AP cooperate to transmit radio frames to one STA in parallel (simultaneously).
• FIG. 3 shows a functional configuration example of A P (A P 102, A P 104).
• a P has, as an example, a wireless LAN control unit 301, a frame generation unit 302, a B S S c O I o r setting unit 303, a U control unit 304, a storage unit 305, and an antenna 3 06.
• the wireless LAN control unit 301 is configured to include a circuit for transmitting/receiving a wireless signal to/from another wireless LAN device (for example, another AP or S T A) and a program for controlling them.
• the wireless LAN control unit 301 is I E E E 802.
• the wireless LAN communication control such as the transmission of the frame generated by the frame generation unit 302 and the reception of the wireless frame from another wireless LAN device is executed.
• the frame generation unit 302 generates a wireless frame to be transmitted by the wireless LAN control unit 301 based on the data to be transmitted to ST A received from another AP, for example.
• the frame generator 302 For example, a radio frame containing data to be transmitted to the STA to other APs and a trigger frame (J TX TF) instructing the timing that the radio frame containing the data should be transmitted to the STA. To generate.
• the B S S c o r o setting unit 303 sets the B S S c o l o r of the radio frame.
• the BSS c ⁇ I ⁇ r setting unit 303 uses, for example, the BSS c ⁇ I ⁇ when the own device (AP 102 or AP 104) constructs a BSS (basic service set). Set r.
• BSS basic service set
• the BSS c o r o r setting unit 303 sets the value of the BSS c o I o r for the radio frame transmitted to the STA connected to its own device.
• the BSS c ⁇ ⁇ ⁇ r setting unit 303 when transmitting data by J TX to the STA connected to another AP, sends this to the wireless frame to be transmitted to that STA.
• a plurality of radio frames received by an STA can be a radio frame in which BSS c ⁇ I ⁇ r used by the BSS to which the STA is connected is set. Therefore, the STA and multiple radio frames received from multiple APs can all be treated as an intra-BSS frame.
• the BSS c ⁇ I ⁇ r setting unit 303 sets the BSS c ⁇ I ⁇ r of the BSS constructed by the own device for radio frames other than JTX, so ST A connected to another AP does not , The radio frame can be handled as an inter-BSS frame.
• STA may execute different control depending on whether the received radio frame is an intra-BSS frame or an lnter_BSS frame.
• STA may transmit a radio frame when the received power of the radio frame does not exceed a predetermined value.
• the predetermined value for the nter — BSS frame is set to the predetermined value for the ntra _ BSS frame. It can be higher than the value. According to this, even if the radio frame is received with power exceeding the predetermined value for the ntra-BSS frame, if the radio frame is the nter_BSS radio frame, the STA gives an opportunity to transmit. It may be possible to obtain.
• APs can use the BSS c ⁇ I ⁇ r that is different from other APs, except when J TX is in progress, to increase the communication opportunities of STAs connected to other APs, and to increase the frequency of the entire system.
• the utilization efficiency can be improved.
• the UI control unit 304 is configured to include hardware related to a user interface (U) such as a touch panel or a button for accepting an operation on the AP by a user (not shown) of the AP and a program for controlling them. ..
• the U control unit 304 also has a function of presenting information to the user, such as displaying an image or outputting a sound.
• the storage unit 305 is configured to include a storage device such as a ROM (R e ad O n l y Me m o r y) and a RAM (R a n d om Ac c e s s Me mory) for storing programs executed by the AP and various data.
• STA has a function as a general STA.
• S T A may have the function of receiving the radio frames transmitted in the Mult i -A P Co r d i n a t i o n configuration.
• FIGS. 4 to 6 an example of the structure of P P D U (P h y s i c a l l a y e r (P HY) P r o t o c o l D a t a U n i t) conforming to the I E E E 802.11 EHT standard will be described.
• Figure 4 shows an example of an EHT SU (Single User) PP DU, which is a PP DU for single-user communication
• Figure 5 shows an example of an EHT MU (Mu Iti U ser) PPDU for multi-user communication. Is shown.
• Figure 6 shows E H T E R for long distance transmission.
• ERPP DU is used when communication range between AP and single STA should be expanded. Note that each field of PPDU must be Need not be arranged in the order shown in FIGS. 4 to 6, and may include a new field not shown in FIGS. 4 to 6.
• P P DU is ST F (S h o r t T r a i n i n g F i e l d), L
• L (L egacy) -ST is provided to ensure backward compatibility with the IEEE 802.11 a/b/g/n/a X standard. It has an F401, an L-LT F402, and an L_S G403.
• L-ST F L-S T F 501 and L-S T F 601
• L-LT F (L-LT F 502 and L-LT F 602)
• L-S I G (L-S I G 503 and L-S G G 603).
• L-LTF is placed immediately after L-STF and L-SIG is placed immediately after L-LTF.
• the configurations of FIGS. 4 to 6 further include R L -S I G (R e p e a t e d L -S I G, R L -S I G 404, R L -S I G 504, and R L -S I G 604) arranged immediately after the L -S I G. In the R L-S I G field, the contents of L — S G are transmitted repeatedly.
• the RL—SIG allows the receiver to recognize that it is a PP DU that complies with the IEEE 802.1 1 a X standard and later standards. In some cases, the RL—SIG may be added to the EEE 802.1 1 EHT. It may be omitted. Further, instead of R L-S I G, a field may be provided to allow the recipient to recognize that it is the P P D U of I E E E802.11 E H T.
• the L-ST F401 is used for detection of a physical layer (P HY) frame signal, automatic gain control (AGC), detection of timing, and the like.
• the L-LT F402 is used for highly accurate frequency/time synchronization and acquisition of propagation channel information (CS I: Channel Status I in formation).
• L-SIG 403 is used to transmit control information including data transmission rate and Phy frame length information.
• Legacy devices that comply with the IEEE 802.1 1 a/b/g/n/a X standard Can decode the various legacy fields described above.
• Each PP DU is further arranged immediately after RL—S G to transmit EHT—SIG (E HT-S I G-A405, EH TS I) for transmitting control information for E HT. GA 505, EH TS ⁇ G-B 506, E HT-S I G-A6 05) are included. Further, each P P DU has ST F for E HT (E HT-ST F4 06, 507, 606) and LT F for E HT (E HT-LT F407, 508, 607).
• Each P P DU has a data field 408, 509, 608 and a P acket e x t e n t i o n field 409, 71 0, 609 after these control fields.
• the field from L-S T F to E HT—LT F of each P P D U is called the P H Y preamble.
• FIGs. 4 to 6 show PPDUs capable of ensuring backward compatibility as an example, when backward compatibility is not required to be ensured, for example, the legacy field is omitted. May be. In this case, for example, to establish synchronization,
• EHT-STF or EHT-LTF is used instead of L-STF and L-LTF. And in this case, one of the EHT-STF and the EHT-LTTF after the EHT-S G field may be omitted.
• S I G-A 405 and 605 include E H T-S I G-A 1 and E H T-S G G-A2, which are required for reception of P P D U, as shown in Tables 1 and 2 below.
• EH TS I G-A 1 contains a 6-bit “BSS color” subfield.
• the EHT-SIG-A 505 of the EHT MU PP DU in Fig. 5 is also required to receive the PP DU as shown in Tables 3 and 4 below. Including I G-A 2. Also in this PPDU, a 6-bit “BSS color” subfield is included in E HT— SIG— A 1. Note that the configurations in Tables 1 to 4 are merely examples, and information other than the information shown in these tables may be included in the EHT_S G field and some of the information shown in these tables. Is EH T_S ⁇ G .. # ⁇ 7: ⁇ 3 ⁇ 4 one ⁇
• FIGS. 7 and 8 show an example of the processing flow executed by the AP as described above and an example of the processing flow executed by the wireless communication network.
• Fig. 7 shows an example of the process flow in the wireless communication network
• Fig. 8 shows an example of the process flow executed by AP 102 and AP 104.
• a P 102 constructs a first B S S (B S S 1) (F 701,
• B S S 1 is set to use B S S c ⁇ I ⁇ r 1.
• a P 104 also builds a second BSS (BSS 2) (F 702, S 801).
• B S S 2 is set to use B S S c o l o r 2 which is different from B S S c o I o r 1.
• Each AP broadcasts the IEEE 802.11 Beacon at a constant cycle and accepts a connection request from the STA, so that between the STA and another STA or between the STA and the DS (Distribution System). ) Will be in a state of mediating the communication with.
• a P 102 executes a connection procedure with STA 103 and transitions to a connected state (F 703). Similarly, it is assumed that A P 104 has performed the connection procedure with S T A 105 and has transitioned to the connected state (F 704). In this connection procedure, as in the case of IEE E802.11aX, A P notifies S T A of the operational status information.
• This operational status information includes the value of BSS c o l o r.
• B S S c o l o i ⁇ i 6 bits of information that identifies B S S included in the preamble of the physical layer (P H Y) as described above.
• BSS c ⁇ I ⁇ r Based on the value of BSS c ⁇ I ⁇ r, it is possible to determine whether the received wireless frame is a BSS (intra-BSS) frame to which the STA belongs or a BSS (inter-BSS) frame to which the STA does not belong. can do
• a P 102 may send a radio frame to S T A 103 (F 705).
• This radio frame is the PP DU shown in any of Figures 4 to 6, and the value indicating BSS c ⁇ I ⁇ r 1 used in BSS 1 is included in the BSS c ⁇ ⁇ r subfield. Is stored.
• AP 104 is STA 1 05 ⁇ 02020/175052 17 ⁇ (: 171?2020/004259
• the wireless frame may be transmitted to (706).
• This radio frame is also 0 II shown in any of Figures 4 to 6, and 633 ⁇ ⁇ ⁇ ⁇ “The subfield is a value that indicates the number 33 ⁇ ⁇ I ⁇ ”2 that is used in Mitsui 332. Is stored. 633 ⁇ ⁇ ⁇ ⁇ “The sub-field is, as shown in the table above,
• 8 102 and 104 decide to perform data transmission to the common 3 cho in parallel in parallel. For example, when 8 104 detects that there is a large amount of data to be transmitted to 3 8-105, it collaborates with the other 8 in the surroundings, 8 102, in parallel. , 3-810 can decide to send data.
• 8 102 or 8 104 indicates, for example, that there will be future large-capacity data communication even if there is no plan for large-capacity data communication to specific 3 units. May decide to prepare for coordinated transmission with. If it is decided that coordinated transmission by more than one will occur or be prepared for it, then 8 102 and 8 104 will: 3 3 I ⁇ ) (707, 3802).
• the negotiation may determine whether the eight performing the negotiation act as IV! _ 8 or 3 _ 8 respectively.
• eight 91 02 will act as IV!—Hachi (Hiromi 3 in 708, 3803) and eight 104 will act as 3-8 (709,
• 3-104 which is 8-104, connects to its own device. ⁇ 02020/175052 18 ⁇ (: 171-1? 2020 /004259
• the information of the 3rd and 8th can include the information of the 1 ⁇ /1880 (medium access control) address of the 3rd and 8th. Information may be sent from 3-8 to 1 ⁇ /1-8 at other timings, such as exchanges between 8 at the time of negotiation, etc. Also, 8 102 connects to its own device. The information of 3 103 inside and the information of 633 ⁇ ⁇ I ⁇ “1 used in the Mitsumi 331 built by the device itself may be notified to 8 10 04.
• 8 10 02 And 8 104 do ⁇ X to send data to a specific 3 crocodile,'' from 8 being connected to the 3 crocodile to the other 8 ⁇ ⁇ I ⁇ “Information may be notified.
• 1 ⁇ /1_8 is the transmission of data to be transmitted, which will be described later.” No. 33 ⁇ ⁇ I ⁇ ”can be specified, so information does not have to be provided from IV!—8 to 3-8 at this point.
• BSS c ⁇ I ⁇ r 1 may be notified from AP 102 to AP 104 as information on the BSS color to be used.
• the PP DU includes the PHY preamble that notifies the BSS color, so the information of BSS c ⁇ I ⁇ r that is naturally used is notified.
• SAP receives a radio frame with BSS c ⁇ I ⁇ r different from the BSS color used by its own device, but since it is operating in J TX mode, the SAP No data is discarded.
• the AP 102 After transmitting/receiving the transmission target data, the AP 102 transmits a J TX trigger frame (TF) to the AP 1 04 in order to transmit the radio frame including the transmission target data (F 7 1 3 , S 808, S 81 4).
• TF J TX trigger frame
• AP 102 can instruct AP 104 that AP 104 should transmit a radio frame to STA 105 by J TX TF and specify the transmission timing.
• AP 102 and AP 104 for example, transmit data to STA 105 in parallel at the timing specified by TX TF (YES in S 809) (F 7 1 4, F 7 1 5). , S 81 0).
• the transmission timing may be after a predetermined time (SIFS, Short Interval Frame Rate) has elapsed since the transmission/reception of J TX TF.
• SIFS Short Interval Frame Rate
• J TX TF may be transmitted at a timing corresponding to the timing at which AP 102 and AP 104 should transmit a radio frame to ST A 105.
• the J TX TF frame also contains information that specifies the transmission timing. ⁇ 02020/175052 20 ⁇ (: 171? 2020 /004259
• the eight 102 and eight 104 can determine when to transmit the wireless frame by using the designated transmission timing and the timer or clock in the own device. In this way, by using the J TX D8 and Y8 104, the wireless frames can be transmitted in synchronization with each other.
• the data transmission target is used by Mitsumi 33 to which the data transmission target 3-8 belongs (3-8 is connected 8).
• ⁇ ⁇ ⁇ ⁇ ” is set to 1 to 1 preamble in the radio frame.
• 3rd to 105th of the data transmission target belongs.
• Used in ⁇ ⁇ I ⁇ “2 is set in the radio frame. That is, 8 104 transmits the radio frame using the same as the 33 33 ⁇ ⁇ ⁇ ”2 used in its own device.
• 02 is used by own device ⁇ ⁇ ⁇ ⁇ “Minami 33 ⁇ ⁇ I ⁇ ” different from 1 is used to transmit a radio frame.
• 8 102 is the same as the 33 of the 33 built by the device itself, but does not change the 33 33 ⁇ ⁇ I ⁇ ”, but when sending data with Ding X, the destination of the data is Of which 3 chome belongs Used in 3 3 ⁇ ⁇ ⁇ ”is set in the radio frame and transmitted. At this time, 8 ”is ”3 ”(3 ct 1 03) can send data to. In this case, 8102 can set the wireless frame to 633 ⁇ ⁇ ⁇ ⁇ “1” used in the 331 built by the device itself to transmit data. When operating in the mode, the number 33, the number 33, to which 3-8 belongs, is set in the radio frame and is transmitted.
• 8 104 is In the case of the 332 built by the device itself, ⁇ 33 ⁇ ⁇ ⁇ ⁇ “2 is used, but for example, to 3 chome 108 103”
• 633 ⁇ ⁇ I ⁇ A radio frame with 1 set can be transmitted to 3/8/103.
• 8/104 does not change to 332 of 332, 33 ⁇ ⁇ ⁇ ⁇ ”.
• the present invention supplies a program that implements one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device. Can also be realized by the process of reading and executing the program. It can also be implemented by a circuit that implements one or more functions (for example, AS IC).

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